Transistor devices, and methods of forming transistor devices and circuit devices

Abstract

The invention includes methods of forming circuit devices. A metal-containing material comprising a thickness of no more than 20 Å (or alternatively comprising a thickness resulting from no more than 70 ALD cycles) is formed between conductively-doped silicon and a dielectric layer. The conductively-doped silicon can be n-type silicon and the dielectric layer can be a high-k dielectric material. The metal-containing material can be formed directly on the dielectric layer, and the conductively-doped silicon can be formed directly on the metal-containing material. The circuit device can be a capacitor construction or a transistor construction. If the circuit device is a transistor construction, such can be incorporated into a CMOS assembly. Various devices of the present invention can be incorporated into memory constructions, and can be incorporated into electronic systems.

1. A method of forming a circuit device, comprising:
 forming a dielectric layer over a substrate;  
 forming a metal-containing material directly on the dielectric layer, the metal-containing material being formed to a thickness of no more than about 20 Å;  
 forming conductively-doped silicon directly on the metal-containing material; and  
 wherein the conductively-doped silicon directly on the metal-containing material; and  
 wherein the conductively-doped silicon is n-type doped, and wherein a work function of the conductively-doped silicon and material-containing material together is shifted relative to the work functions of the conductively-doped silicon and the metal-containing material in pure form, and is shifted from the work function of the metal-containing material in pure form, and is shifted from the work function of the metal-containing material in pure form by at least 50 millivolts.  
 
   
   
     2. A method of forming a circuit device, comprising:
 forming a dielectric layer over a substrate;  
 forming a metal-containing material directly on the dielectric layer, the metal- containing material being formed to a thickness of no more than about 20 Å;  
 forming conductively-doped silicon directly on the metal-containing material; and wherein: 
   the circuit device is a capacitor construction,    the substrate comprises a first electrical node of the capacitor, and    the conductively-doped silicon is comprised by a second electrical    
 node spaced from the first electrical node by at least the dielectric layer.  
 
 
   
   
     3. A method of forming a circuit device, comprising:
 forming a dielectric layer over a substrate;  
 forming a metal-containing material directly on the dielectric layer, the metal- containing material being formed to a thickness of no more than about 20 Å;  
 forming conductively-doped silicon directly on the material-containing material; and  
 wherein forming the conductively-doped silicon comprises deposition of silicon on the metal-containing material, and wherein a composition comprising silicon and metal of the metal-containing material forms at the interface of the metal-containing material and the silicon.  
 
   
   
     4. A method of forming a circuit device, comprising:
 forming a dielectric layer over a substrate;  
 forming a metal-containing material directly on the dielectric layer, the metal-containing material being formed to a thickness of no more than 20 Å;  
 forming conductively-doped silicon directly on the metal-containing material; and  
 wherein the dielectric layer comprises one or more of tantalum, hafnium and aluminum.  
 
   
   
     5. A method of forming a circuit device, comprising:
 forming a dielectric layer over a substrate;  
 forming a metal-containing material directly layer, the metal- containing material being formed to a thickness of no more than about 20 Å;  
 forming conductively-doped silicon directly on the metal-containing material; and  
 wherein the metal-containing comprises one or more of titanium nitride, tantalum nitride, hafnium nitride and tungsten nitride.  
 
   
   
     6. A method of forming a circuit device, comprising:
 forming a dielectric layer over a substrate;  
 forming a metal-containing material directly on the dielectric layer, the metal- containing material being formed to a thickness of no more than about 20 Å;  
 forming conductively-doped silicon directly on the metal-containing material; and  
 wherein the metal-containing material comprises one or more of titanium silicide, tantalum silicide, hafnium silicide and tungsten silicide.  
 
   
   
     7. A method of forming a transistor device, comprising:
 forming a gate dielectric layer over a substrate;  
 forming a metal-containing material over the gate dielectric layer, the metal- containing material being formed with no more than about 70 ALD cycles;  
 forming conductively-doped silicon on the metal-containing material;  
 patterning the metal-containing material and conductively-doped silicon into a gate stack;  
 providing source/drain regions proximate the gate stack;  
 wherein the conductively-doped silicon is n-type doped; and  
 wherein a work function of the conductively-doped silicon and metal-containing material together is shifted relative to the work functions of the conductively-doped silicon and the metal-containing material in pure form, and is shifted from the work function of the metal-containing material in pure form by at least 50 millivolts.  
 
   
   
     8. A method of forming a transistor device, comprising:
 forming a gate dielectric layer over a substrate;  
 forming a metal-containing material over the gate dielectric layer, the metal- containing material being formed with no more than about 70 ALD cycles;  
 forming conductively-doped silicon over the metal-containing material;  
 patterning the metal-containing material and conductively-doped silicon into a gate stack;  
 providing source/drain regions proximate the gate stack;  
 wherein forming the conductively-doped silicon comprises deposition of silicon on the metal-containing material; and  
 wherein a composition comprising silicon and metal of the metal-containing material forms at the interface of the metal-containing material and the silicon.  
 
   
   
     9. A method of forming a transistor device, comprising:
 forming a gate dielectric layer over a substrate;  
 forming a metal-containing material over the gate dielectric layer, the metal- containing material being formed with no more than about 70 ALD cycles;  
 forming conductively-doped silicon over the metal-containing material;  
 patterning the metal-containing material and conductively-doped silicon into a gate stack;  
 providing source/drain regions proximate the gate stack; and  
 wherein the dielectric layer comprises one or more of tantalum, hafnium and aluminum.  
 
   
   
     10. A method of forming a transistor device, comprising:
 forming a gate dielectric layer over a substrate;  
 forming a metal-containing material over the gate dielectric layer, the metal- containing material being formed with no more than 70 ALD cycles;  
 forming conductively-doped silicon over the metal-containing material;  
 patterning the metal-containing material and conductively-doped silicon into a gate stack;  
 providing source/drain regions proximate the gate stack; and  
 wherein the metal-containing material comprises one or more of titanium nitride, tantalum nitride, hafnium nitride and tungsten nitride.  
 
   
   
     11. A method of forming a transistor device, comprising:
 forming a gate dielectric layer over a substrate;  
 forming a metal-containing material over the gate dielectric layer, the metal-containing material being formed with no more than about 70 ALD cycles;  
 forming conductively-doped silicon over the metal-containing material;  
 patterning the metal-containing material and conductively-doped silicon into a gate stack;  
 providing source/drain regions proximate the gate stack; and  
 wherein the metal-containing material comprises one or more of titanium silicide, tantalum silicide, hafnium silicide and tungsten silicide.  
 
   
   
     12. A method of forming a transistor device, comprising:
 forming a gate dielectric layer over a substrate;  
 forming a metal-containing material over the gate dielectric layer, the metal-containing material being formed with no more than about 70 ALD cycles;  
 forming conductively-doped silicon over the metal-containing material;  
 patterning the metal-containing material and conductively-doped silicon into a gate stack;  
 providing source/drain regions proximate the gate stack; and  
 wherein the metal of the metal-containing material predominately comprises tantalum.  
 
   
   
     13. A method of forming a transistor device, comprising:
 forming a gate dielectric layer over a substrate;  
 forming a metal-containing material over the gate dielectric layer, the metal-containing material being formed with no more than about 70 ALD cycles;  
 forming conductively-doped silicon over the metal-containing material;  
 patterning the metal-containing material and conductively-doped silicon into a gate stack;  
 providing source/drain regions proximate the gate stack; and  
 wherein the metal of the metal-containing material predominately comprises hafnium.  
 
   
   
     14. A method of forming a transistor device, comprising:
 forming a gate dielectric layer over a substrate;  
 forming a metal-containing material over the gate dielectric layer, the metal-containing material being formed with no more than about 70 ALD cycles;  
 forming conductively-doped silicon over the metal-containing material;  
 patterning the metal-containing material and conductively-doped silicon into a gate stack;  
 providing source/drain regions proximate the gate stack; and  
 wherein the metal of the metal-containing material predominately comprises tungsten.  
 
   
   
     15. A transistor device, comprising:
 a gate dielectric layer over a substrate, wherein the dielectric layer comprises one or more of tantalum, hafnium and aluminum;  
 a gate stack over the gate dielectric layer, and  
 source/drain regions proximate the gate stack;  
 wherein the gate stack comprises: 
 a metal-containing material over the gate dielectric layer, the metal- containing material having a thickmess of no more than about 20 Å; and  
 a conductively-doped silicon layer over the metal-containing material.  
 
 
   
   
     16. The transistor device of  claim 15  wherein the gate dielectric layer comprises aluminum oxide. 
   
   
     17. The transistor device of  claim 16  wherein the metal-containing material is physically against the aluminum oxide. 
   
   
     18. The transistor device of  claim 16  wherein the gate dielectric layer comprises the aluminum oxide over silicon dioxide. 
   
   
     19. An electronic system comprising the transistor device of  claim 15 . 
   
   
     20. A transistor device, comprising:
 a gate dielectric layer over a substrate;  
 a gate stack over the gate dielectric layer, and  
 source/drain regions proximate the gate stack;  
 wherein the gate stack comprises; 
 a metal-containing material over the gate dielectric layer, the metal- containing material having a thickness of no more than about 20 Å and predominately comprising one or more of titanium nitride, tungsten nitride, tantalum nitride and hafnium nitride; and  
 a conductively-doped silicon layer over the metal-containing material.